Polar plate and electrolytic cell

Abstract

The utility model discloses a pole plate and an electrolytic bath, and relates to the technical field of electrolysis, the pole plate comprises a plate body and a pole frame surrounding the plate body, the pole frame is provided with an electrolyte inlet and an electrolytic product outlet, the electrolyte inlet and the electrolytic product outlet are distributed on the two opposite sides of the plate body in the first direction, and the surface of the plate body is provided with a plurality of flow guide ribs; a plurality of flow guide channels are formed by the plurality of flow guide ribs; the multiple flow guide channels comprise at least one group of first flow guide channels, each group of first flow guide channels comprises a leading-in section and a multi-stage shunting section which are sequentially arranged and communicated in the first direction, and the electrolyte inlet is communicated with the electrolytic product outlet through the leading-in section and the multi-stage shunting section in sequence; each stage of shunting section comprises a plurality of shunting channels arranged side by side in the second direction, an included angle is formed between the second direction and the first direction, and the number of the shunting channels of the multiple stages of shunting sections is sequentially increased in the first direction. The technical scheme provided by the utility model aims to improve the flow distribution uniformity of the electrolyte on the surface of the polar plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrolysis, in particular to an electrode plate and an electrolytic cell. BACKGROUND

[0002] At present, the surface of the electrode plate is formed with a completely uncontrolled free flow field structure by papillae or stretched net / elastic net, so that the flow distribution in each area of the cell is uneven, which leads to uneven distribution of temperature and current density, reduces the electrode life and increases the direct current consumption. CONTENT OF THE UTILITY MODEL

[0003] The main purpose of the present application is to provide an electrode plate and an electrolytic cell, which aims to improve the uniformity of flow distribution of electrolyte on the surface of the electrode plate.

[0004] To achieve the above-mentioned purpose, the electrode plate provided by the present application comprises a plate body and an electrode frame arranged around the plate body, the electrode frame is provided with an electrolyte inlet and an electrolyte product outlet, the electrolyte inlet and the electrolyte product outlet are distributed on opposite sides of the plate body along a first direction, the surface of the plate body is provided with a plurality of flow guide ribs, and a plurality of flow guide channels are formed by the plurality of flow guide ribs;

[0005] The plurality of flow guide channels comprises at least one group of first flow guide channels, the group of first flow guide channels comprises a guide-in segment and a plurality of shunt segments arranged in sequence and communicated in the first direction, the electrolyte inlet is communicated with the electrolyte product outlet in sequence through the guide-in segment and the plurality of shunt segments, each shunt segment comprises a plurality of shunt channels arranged side by side in a second direction, the second direction and the first direction form an angle, and the number of shunt channels of the plurality of shunt segments increases in sequence in the first direction.

[0006] In an embodiment, the shunt channel comprises a side bias segment forming an angle with the first direction and a parallel segment parallel to the first direction, and the side bias segment and the parallel segment are distributed and connected along the first direction.

[0007] In an embodiment, the angle between the side bias segments of two adjacent shunt channels is less than or equal to 90 degrees.

[0008] In an embodiment, among two adjacent shunt segments, the height of the side bias segment located upstream in the first direction is equal to twice the height of the side bias segment located downstream in the first direction.

[0009] In an embodiment, the parallel segment with the side bias segments connected at both ends is defined as a first parallel segment, and the height of the first parallel segment in the first direction is two to five times the width in the second direction.

[0010] In an embodiment, the introduction section comprises a first section gradually expanding in the first direction and a second section extending parallel to the channel walls on both sides, the height of the second section in the first direction being two to five times the width of the second section.

[0011] In an embodiment, the polar frame is formed with an introduction channel communicating with the electrolyte inlet, the introduction channel comprising a first introduction section and a second introduction section, the first flow guide channels being distributed in groups in the second direction, the second introduction section extending in the second direction and being formed with a plurality of guide outlets, one guide outlet for one introduction section to dock and communicate, one end of the first introduction section communicating with the electrolyte inlet and the other end communicating between the two ends of the second introduction section.

[0012] In an embodiment, the first introduction section has at least one bend.

[0013] In an embodiment, the number of guide outlets is 2 to 8.

[0014] In an embodiment, the width of the guide outlet is greater than or equal to 2 mm.

[0015] In an embodiment, the first introduction section is connected to the middle of the second introduction section, and the same number of groups of first flow guide channels are distributed between each end of the second introduction section and the connection position of the first introduction section.

[0016] In an embodiment, the width of the first introduction section is greater than or equal to twice the width of the second introduction section.

[0017] In an embodiment, the ratio of the width of the second introduction section to the width of the guide outlet is greater than or equal to one half of the total number of guide outlets.

[0018] In an embodiment, the opening angle between the two parts of the second introduction section extending away from the connection position of the first introduction section is directed away from the first introduction section.

[0019] In an embodiment, the flow guide ribs are also formed with a collection channel, the collection channel being located near the edge of the plate body close to the electrolysis product outlet and communicating with the electrolysis product outlet, one collection channel corresponding to a plurality of groups of first flow guide channels.

[0020] In an embodiment, the first flow guide channel further comprises a confluence section between the distribution section and the collection channel, the number of channels distributed in the second direction of the confluence section being less than the number of distribution channels provided at the outlet of the distribution section.

[0021] In an embodiment, a plurality of stages of the collecting sections are provided between the distributing sections and the collecting channels, and the number of channels distributed in the second direction of each stage of the collecting sections decreases in the first direction in sequence.

[0022] In an embodiment, the channel walls at the outlet of the most downstream distributing section extend to the collecting channels.

[0023] In an embodiment, at the outlet of the most downstream distributing section, the channel walls on opposite sides of each distributing channel extend to the collecting channels, or one of the channel walls on the same side of each distributing channel in the second direction extends to the collecting channels.

[0024] In an embodiment, the polar frame is formed with a lead-out channel communicating with the electrolysis product outlet, and one of the collecting channels communicates with the electrolysis product outlet through the lead-out channel.

[0025] In an embodiment, the lead-out channel has at least one bend.

[0026] In an embodiment, the lead-out channel gradually moves away from the outlet of the corresponding collecting channel in the first direction.

[0027] In an embodiment, the channel wall of the collecting channel connecting the lead-out channel extends obliquely in the first direction, gradually approaching the lead-out channel.

[0028] In an embodiment, the flow guide rib is further formed with a second flow guide channel, the second flow guide channel and the first flow guide channel are arranged alternately in the second direction, one of the second flow guide channels is arranged on each side of the first flow guide channel, in the first direction, the number of channels in the first flow guide channel first increases and then decreases, the number of channels in the second flow guide channel first decreases and then increases, and the position of the change in the number of channels of the second flow guide channel is arranged correspondingly to the position of the change in the number of channels of the first flow guide channel.

[0029] In an embodiment, the flow guide rib is further formed with a third flow guide channel, the third flow guide channel is located on the side of the plate body in the second direction and is adjacent to the second flow guide channel, in the first direction, the number of channels in the third flow guide channel first increases and then decreases, and the position of the change in the number of channels of the third flow guide channel is arranged correspondingly to the position of the change in the number of channels of the second flow guide channel, and the number of stages of distribution of the third flow guide channel is less than the number of stages of collection of the second flow guide channel, and the number of stages of collection of the third flow guide channel is less than the number of stages of distribution of the second flow guide channel.

[0030] In an embodiment, the second flow channel has a number of converging stages equal to a number of diverging stages of the first flow channel, and a number of diverging stages equal to a number of converging stages of the first flow channel.

[0031] In an embodiment, the first flow channel and the second flow channel are spaced apart by a channel wall.

[0032] In an embodiment, the third flow channel and the second flow channel are spaced apart by a channel wall.

[0033] In an embodiment, at least one of the first flow channel, the second flow channel and the third flow channel is symmetrically distributed with a symmetry axis being an axis along which the polar plate extends in the second direction.

[0034] In an embodiment, the flow guide rib includes a guide rib corresponding to a junction or a bifurcation of the flow channel, the guide rib having a guide wall surface in the shape of an arc surface or an inclined surface.

[0035] In an embodiment, the flow guide rib is further formed with a partition channel, there being one partition channel between two adjacent flow channels of the same stage, the partition channel having a closed end close to the inlet section and a notched end away from the inlet section.

[0036] In an embodiment, the closed end of the partition channel is in the shape of a sharp corner or an arc protruding towards the inlet section.

[0037] In an embodiment, the flow guide rib extends in the first direction and is provided with a via hole extending in the second direction.

[0038] In an embodiment, the via hole has a diameter less than or equal to half of a height of the flow guide rib, there are a plurality of via holes spaced apart in the first direction, and in any two adjacent via holes, one is close to a top of the flow guide rib and the other is close to a bottom of the flow guide rib.

[0039] The present application also provides an electrolytic cell comprising the polar plate as described above.

[0040] In the technical solution of this application, the inlet section is located on the side close to the electrolyte inlet. The electrolyte flowing in from the electrolyte inlet can flow through the inlet section of the first guide channel and the multi-stage diversion section to the surface of the electrode plate. Since the multi-stage diversion section is set, and each stage of the diversion section forms multiple diversion channels arranged side by side in the second direction, the electrolyte can be dispersed in different diversion channels along the second direction. The first guide channel extends in the first direction, and the electrolyte, guided by the first guide channel, can also be dispersed in different sections of the first guide channel in the first direction. This greatly improves the uniformity of the electrolyte flow distribution on the plate surface, reduces the flow dead zone, slows down the electrode decay rate, reduces DC power consumption, and improves current efficiency. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0042] Figure 1 A schematic diagram of the structure of an embodiment of the electrode plate provided in this application;

[0043] Figure 2 for Figure 1 A partial structural cross-sectional view;

[0044] Figure 3 for Figure 1 A schematic diagram of the structure of the electrode plate from another perspective;

[0045] Figure 4 for Figure 3 A partial structural schematic diagram of one embodiment of the electrode plate;

[0046] Figure 5 for Figure 3 A partial structural cross-sectional view of an embodiment of the electrode plate;

[0047] Figure 6 for Figure 3 Another partial structural schematic diagram of an embodiment of the electrode plate;

[0048] Figure 7 for Figure 3 A partial structural schematic diagram of another embodiment of the electrode plate;

[0049] Figure 8 A partial cross-sectional view of an embodiment of the guide ribs of the electrode plate provided in this application along its extension direction;

[0050] Figure 9A cross-sectional view of an embodiment of the flow guide rib of the plate provided in the present application;

[0051] Figure 10 A structural schematic diagram of another embodiment of the plate provided in the present application;

[0052] Figure 11 A structural schematic diagram of another embodiment of the plate provided in the present application;

[0053] Figure 12 A structural schematic diagram of another embodiment of the plate provided in the present application;

[0054] Figure 13 A structural schematic diagram of another embodiment of the plate provided in the present application.

[0055] BRIEF DESCRIPTION OF THE DRAWINGS

[0056] 100, plate body; 200, polar frame; 210, electrolyte inlet; 220, electrolysis product outlet; 230, introduction channel; 231, first introduction section; 232, second introduction section; 233, guide outlet; 240, outlet channel;

[0057] 310, flow guide rib; 311, via hole; 312, guide rib; 320, flow guide channel;

[0058] 400, first flow guide channel; 410, introduction section; 411, first section; 412, second section; 420, distribution section; 421, distribution channel; 4211, side deviation section; 4212, parallel section; 430, convergence section;

[0059] 500, second flow guide channel; 600, third flow guide channel; 700, collection channel; 800, separation channel.

[0060] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0062] It should be noted that if the application embodiments involve directionality indication (such as up, down, left, right, front, back, …), the directionality indication is only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directionality indication will also change accordingly.

[0063] In addition, if the application embodiments involve "first", "second" and the like, the "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, "and / or" or "and / or" appears throughout the text, which means that the three parallel schemes include "A and / or B", which includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed in the present application.

[0064] The application provides a polar plate.

[0065] Please refer to Figures 1 to 3 、 Figure 6 、 Figures 10 to 13 In an embodiment of the application, the polar plate comprises a plate body 100 and a polar frame 200 surrounding the plate body 100, the polar frame 200 is provided with an electrolyte inlet 210 and an electrolyte product outlet 220, the electrolyte inlet 210 and the electrolyte product outlet 220 are distributed on opposite sides of the plate body 100 along a first direction, the surface of the plate body 100 is provided with a plurality of flow guide ribs 310, and a plurality of flow guide channels 320 are formed by the plurality of flow guide ribs 310.

[0066] The plurality of flow guide channels 320 include at least one group of first flow guide channels 400, the group of first flow guide channels 400 includes a guide-in section 410 and a plurality of shunt sections 420 arranged in sequence and communicated in the first direction, the electrolyte inlet 210 is communicated to the electrolyte product outlet 220 in sequence through the guide-in section 410 and a plurality of shunt sections 420, and each shunt section 420 includes a plurality of shunt channels 421 arranged side by side in a second direction, the second direction and the first direction form an angle, and the number of shunt channels 421 of the plurality of shunt sections 420 increases in sequence in the first direction.

[0067] It should be noted that the first direction, i.e. the flow direction from the electrolyte inlet 210 to the electrolyte outlet 220, the second direction and the second direction can be perpendicular or close to perpendicular, or be arranged at other angles, and the electrolyte can be an alkali solution. The electrolyte flows from the electrolyte inlet 210 to the surface of the plate body 100, and the gas electrolyte product generated after the electrolysis reaction will flow out of the electrolysis tank together with the electrolyte from the electrolyte outlet 220. In addition, the grading standard of the shunt section 420 is the number of shunt channels 421. The number of shunt channels 421 arranged side by side in the second direction changes, which means that a group of first flow guide channels 400 are provided with at least two shunt sections 420. The number of shunt channels 421 arranged side by side in the shunt section 420 closer to the introduction section 410 is smaller, and the number of shunt channels 421 arranged side by side in each shunt section 420 gradually increases in the direction away from the introduction section 410.

[0068] In the technical scheme of the present application, the introduction section 410 is located on the side close to the electrolyte inlet 210. The electrolyte flowing from the electrolyte inlet 210 can flow through the surface of the electrode plate in turn via the introduction section 410 and the multi-stage shunt section 420 of the first flow guide channel 400. Since the multi-stage shunt section 420 is provided, and each shunt section 420 is formed with a plurality of shunt channels 421 arranged side by side in the second direction, the electrolyte can be dispersed in different shunt channels 421 along the second direction. The first flow guide channel 400 extends in the first direction, and the electrolyte can also be dispersed in different flow sections of the first flow guide channel 400 in the first direction under the guidance of the first flow guide channel 400. This greatly improves the uniformity of the flow distribution of the electrolyte on the surface of the plate body 100, reduces the flow dead zone, delays the electrode decay rate, reduces the direct current consumption and improves the current efficiency.

[0069] Without loss of generality, the widths of the shunt channels 421 arranged side by side in the same shunt section 420 are comparable (equal or approximately equal), so that the consistency of the structure of the shunt channels 421 is high, thereby ensuring the uniformity of the distribution of the electrolyte.

[0070] In an embodiment, please refer to Figure 3 , Figure 6 and Figures 10 to 13The shunt passage 421 comprises a side deviation section 4211 which is at an angle to the first direction and a parallel section 4212 which is parallel to the first direction, and the side deviation section 4211 and the parallel section 4212 are distributed along the first direction and connected. It can be understood that the side deviation section 4211 is at an angle to the first direction, and the parallel section 4212 is parallel to the first direction or at a very small angle, close to parallel. Specifically, the side deviation section 4211 is located at a bifurcation position between the introduction section 410 and the adjacent shunt section 420, or between two adjacent shunt sections 420. The side deviation section 4211 can be in an inclined shape or in an arc shape. Through the transition of the side deviation section 4211, the parallel section 4212 of each shunt passage 421 can be staggered in the second direction from the flow channel of the previous stage, which is more conducive to the uniform distribution of the electrolyte in the second direction. Among them, the width of the side deviation section 4211 is equivalent (equal or approximately equal) to the width of the parallel section 4212. In this way, the width of the shunt flow channel of each stage of the shunt flow channel is relatively uniform, and it is easier to guide the electrolyte to shunt at the bifurcation. Of course, in other embodiments, other structure forms of bifurcation structures can also be used.

[0071] Optionally, referring to Figure 6 The angle θ between the side deviation sections 4211 of the two adjacent parallel sections 4212 is less than or equal to 90 degrees. In this way, the spacing between the two adjacent parallel sections 4212 is not too large, which is conducive to the balanced distribution of the electrolyte along the second direction on the surface of the electrode plate, and the flow channel at the bifurcation is not too large, which can avoid the loss of electrolyte flow rate, so as to ensure the smooth flow of the electrolyte in the first direction. Of course, in other embodiments, the angle can also be set to 90 degrees or more than 90 degrees according to actual needs.

[0072] Optionally, among the two adjacent stages of the shunt sections 420, the height of the side deviation section 4211 located upstream in the first direction is equal to twice the height of the side deviation section 4211 located downstream in the first direction. It can be understood that the height of the side deviation section 4211 in the first direction is also the effective length of the side deviation section 4211 projected in the first direction. Referring to Figure 6 That is, H1=2H2.

[0073] In this way, the length of the side deviation section 4211 of each stage of the shunt section 420 can meet the reliable and effective shunting of the electrolyte, which is conducive to ensuring the uniformity of the flow field of the electrolyte. Further, when the number of shunt passages 421 of each stage of the shunt section 420 is 2, and the angle between the side deviation section 4211 of each stage of the shunt section 420 and the first direction is equivalent, it is also conducive to ensuring the uniformity of the spacing between the adjacent shunt passages 421 of the same stage. Of course, the height of the side deviation section 4211 in the first direction can also meet other relationships according to actual needs.

[0074] Optionally, the parallel section 4212 connected with the side bias sections 4211 at both ends is defined as a first parallel section, and the height of the first parallel section in the first direction is two to five times the width of the first parallel section in the second direction. It should be noted that the ranges described in the present application as a value to a value include the end point values. For example, in the present embodiment, the height of the first parallel section in the first direction is greater than or equal to two times the width of the first parallel section in the second direction, and less than or equal to five times the width of the first parallel section in the second direction. The relevant ranges are described below, and will not be described one by one. Figure 6 That is, 2W1≤L1≤5W1. In the present embodiment, the first parallel section has sufficient extension length, so that the first parallel section provides sufficient buffering effect between the two bifurcations, so as to guarantee the stability and balance of the electrolyte flow field. Of course, when the flow field distribution requirements can be met, the two parameters can also be other proportional relationships, for example, the former is less than two times the latter or the former is greater than five times the latter.

[0075] Optionally, referring to Figure 5 and Figure 6 , the introduction section 410 includes a first section 411 gradually expanding in the first direction and a second section 412 extending in parallel with the two side channel walls in the first direction, and the height of the second section 412 in the first direction is two to five times the width of the second section 412 in the second direction, referring to Figure 6 That is, 2W0≤L0≤5W0. Specifically, the two channel walls distributed relative to the first section 411 in the second direction gradually move away in the first direction, and the width of the first section 411 gradually increases in the first direction. The two channel walls distributed relative to the second section 412 in the second direction extend in parallel or substantially in parallel, and the width of the second section 412 does not change or changes little along the first direction. In this way, after the electrolyte flows into the introduction section 410 from the electrolyte inlet 210, the electrolyte can be guided to gradually diffuse by the first section 411. When the introduction section 410 bifurcates to the first bifurcated section 420, the second section 412 can provide sufficient buffering effect to guarantee the uniformity of the electrolyte flow field distribution. Of course, in other embodiments, when the flow field distribution requirements can be met, the two parameters can also be other proportional relationships, for example, the former is less than two times the latter or the former is greater than five times the latter.

[0076] In an embodiment, referring to Figure 3 , Figure 4 and Figures 10 to 13The polar frame 200 is formed with an introduction channel 230 which is communicated with the electrolyte inlet 210, the introduction channel 230 includes a first introduction section 231 and a second introduction section 232, the first flow channel 400 is distributed with multiple groups in the second direction, the second introduction section 232 extends along the second direction and is formed with multiple guide outlets 233, one guide outlet 233 is used for abutting and communicating with one introduction section 410, one end of the first introduction section 231 is communicated with the electrolyte inlet 210, and the other end is communicated between two ends of the second introduction section 232. In this way, the electrolyte at the electrolyte inlet 210 can flow into the second introduction section 232 through the first introduction section 231, and then be distributed to two ends of the second introduction section 232, and then flow into multiple first flow channels 400 through multiple guide outlets 233, so that the electrolyte can be dispersed in the second direction and be distributed relatively uniformly. Of course, in other embodiments, multiple introduction channels 230 which are abuttingly communicated with multiple first flow channels 400 one by one can also be provided.

[0077] Optionally, please refer to Figure 3 、 Figure 4 and Figures 10 to 13 , the first introduction section 231 has at least one bending. In this way, the flow channel length of the first introduction section 231 can be increased in limited space, the bypass resistance is increased, the bypass current is reduced, and the current efficiency is improved. Specifically, the first introduction section 231 can first extend along the second direction away from the electrolyte inlet 210, then be bent, then extend along the second direction to a position close to the electrolyte inlet 210, the distance between the position and the two ends of the second introduction section 232 is appropriate, then the first introduction section 231 extends along the first direction and is abuttingly communicated with the second introduction section 232. Of course, in other ways, the first introduction section 231 can also have other shapes.

[0078] Optionally, the number of guide outlets 233 is 2 to 8. That is, the number of groups of first flow channels 400 is 2 to 8. The number of groups of first flow channels 400 in this range can not only make the electrolyte uniformly distributed in the second direction to ensure uniform distribution of the electrolyte, but also can provide sufficient electrolyte flow to ensure the reaction rate. Of course, in other embodiments, the number of guide outlets 233 can also be other values, for example, 8 to 12.

[0079] Optionally, the width of the guide outlet 233 is greater than or equal to 2 millimeters, please refer to Figure 4That is, B2≥2mm, and specifically, B2may be 2mm or 2.5mm or 3mm or 5mm. In this way, a suitable flow area can be provided so that the electrolyte can be supplied at a proper speed, thereby ensuring the electrolysis reaction rate. Of course, in other embodiments, the width of the outlet 233 can also be other values, such as 1 to 2 millimeters, as long as the flow requirement of the electrolyte is met.

[0080] Optionally, please refer to Figure 3 , Figure 4 and Figures 10 to 13 , the first introduction section 231 is connected to the middle of the second introduction section 232, and the same number of groups of the first flow channels 400 are distributed between each end of the second introduction section 232 and the connection position of the first introduction section 231. After the electrolyte enters the second introduction section 232 from the first introduction section 231, it is divided into two, and the two sections of flow channels in the second introduction section 232 distributed on both sides of the access point of the first introduction section 231 in the second direction will be connected to the same number of first flow channels 400, which is beneficial to make the flow distribution of the electrolyte uniform, thereby ensuring the uniformity of the flow field of the electrolyte. Of course, in other embodiments, the number of groups of the first flow channels 400 distributed between each end of the second introduction section 232 and the connection position of the first introduction section 231 can also be unequal, but the number should be close.

[0081] Optionally, please refer to Figure 3 , Figure 4 and Figures 10 to 13 , the width of the first introduction section 231 is greater than or equal to twice the width of the second introduction section 232, that is Figure 4 B0≥2B1. It can be understood that the width of the second introduction section 232 changes relatively small in the second direction, that is, the width of the second introduction section 232 is relatively uniform, and is less than or equal to half of the first introduction section 231. In this way, the sum of the widths of the above two sections of flow channels of the second introduction section 232 will be less than or equal to the width of the first introduction section 231, which can ensure that the above two sections of flow channels of the second introduction section 232 can be filled with sufficient electrolyte, promoting the continuous flow of the electrolyte. Of course, in other embodiments, if the flow demand of the electrolyte is low, the width of the first introduction section and the width of the second introduction section can also not satisfy the above proportional relationship.

[0082] Optionally, please refer to Figure 4, the ratio of the width B1 of the second introduction section 232 and the width B2 of the guide outlets 233 is greater than or equal to half of the total number of the guide outlets 233. It can be understood that the widths of the guide outlets 233 are equivalent, and half of the total number of the guide outlets 233 is the number of the guide outlets 233 connected to each of the two flow channels of the second introduction section 232. The ratio of the width of the second introduction section 232 and the width of the guide outlets 233 satisfies the above-mentioned proportional relationship, that is, the sum of the widths of all the guide outlets 233 connected to each of the two flow channels of the second introduction section 232 is less than or equal to the corresponding flow channel of the second introduction section 232. In this way, it can be ensured that each guide outlet 233 is filled with sufficient electrolyte to promote the continuous flow of electrolyte. Of course, in other embodiments, if the flow demand of the electrolyte is low, the width of the second introduction section and the width of the guide outlet 233 can not satisfy the above-mentioned proportional relationship.

[0083] In an embodiment, please refer to Figure 4 , the opening of the included angle a between the two parts of the second introduction section 232 extending away from the connection position of the first introduction section 231 faces away from the first introduction section 231. That is, from the position of the first introduction section 231, the second introduction section 232 extends in the first direction away from the first introduction section 231. In this way, the second introduction section 232 will continue to guide the electrolyte to flow in the first direction, which is beneficial to ensure the flow rate of the electrolyte and the smoothness of the flow of the electrolyte. Of course, in other embodiments, when the flow rate of the electrolyte can meet the requirements, the opening of the above-mentioned included angle can be appropriately directed to the first introduction section 231.

[0084] In an embodiment, please refer to Figure 3 , Figures 10 to 13 , the flow guide ribs 310 are also formed with a flow collection channel 700, which is located at the edge of the plate body 100 close to the electrolysis product outlet 220 and is connected to the electrolysis product outlet 220. One flow collection channel 700 corresponds to multiple groups of the first flow guide channels 400. In this way, the electrolyte and the generated gas electrolysis product flowing through the multiple groups of the first flow guide channels 400 can be collected through the flow collection channel 700, so as to better guide the electrolyte and the gas electrolysis product to the electrolysis product outlet 220. For the convenience of description, the combination of the electrolyte and the gas electrolysis product flowing to the electrolysis product outlet 220 is referred to as electrolysis product hereinafter. It should be noted that this definition is only for the convenience of description and is not limited to the composition of the fluid flowing out of the electrolysis product outlet 220.

[0085] Without loss of generality, please refer to Figure 3 , Figures 10 to 13The plurality of flow collection channels 700 are distributed along the second direction, and the number of the flow collection channels 700 is less than the number of the first flow guide channels 400. In this way, the flow collection channels 700 can divide the plate surface of the plate body 100 into zones, which facilitates the collection of the electrolyte and the gaseous electrolysis products. Of course, in other embodiments, the flow collection channels 700 can not be provided, and the first flow guide channels 400 can directly extend to the junction of the plate body 100 and the polar frame 200.

[0086] Optionally, referring to Figure 3 , Figure 10 and Figure 11 , the first flow guide channel 400 further comprises a flow converging section 430 between the flow distribution section 420 and the flow collection channel 700. The number of channels distributed along the second direction of the flow converging section 430 is less than the number of the flow distribution channels 421 provided at the outlet of the flow distribution section 420. In this way, the electrolyte can be preliminarily collected by the flow converging section 430 downstream of the first flow guide channel 400, and then the products of the plurality of first flow guide channels 400 can be collected by the flow collection channel 700, which can better collect the electrolysis products at the electrolysis product outlet 220, thereby ensuring the smooth flow of the electrolysis products.

[0087] Optionally, referring to and

[0088] , a plurality of flow converging sections 430 can be provided between the flow distribution section 420 and the flow collection channel 700, and the number of channels distributed along the second direction of each flow converging section 430 decreases along the first direction. Of course, in other embodiments, only one flow converging section 430 can be provided between the flow distribution section 420 and the flow collection channel 700.

[0088] Optionally, referring to Figure 12 and Figure 13 , the channel wall at the outlet of the most downstream flow distribution section 420 extends to the flow collection channel 700. In this way, the electrolysis products can be directly guided to the flow collection channel 700 through the channel wall. As shown in Figure 12 , the channel walls on opposite sides of each flow distribution channel 421 extend to the flow collection channel 700. As shown in Figure 13 , one of the channel walls on the same side of each flow distribution channel 421 in the second direction extends to the flow collection channel 700, and the other channel wall extends to the middle region of the plate surface, thereby ensuring uniform distribution of the electrolyte. In this way, each flow distribution channel 421 at the outlet of the flow distribution section 420 can be guided one by one through the channel wall and finally collected in the flow collection channel 700. Of course, in other embodiments, the channel walls on the adjacent side or the opposite side of adjacent two flow distribution channels 421 in the second direction can extend to the flow collection channel 700, thereby converging the adjacent two flow distribution channels 421.

[0089] In an embodiment, referring to Figure 3 , Figure 7 and Figures 10 to 13 , the pole frame 200 is formed with a leading channel 240 communicating with the electrolysis product outlet 220, and a current collecting channel 700 communicates with the electrolysis product outlet 220 through the leading channel 240. In this way, the electrolysis product of a current collecting channel 700 is correspondingly guided through a leading channel 240, which can better guide the electrolysis product to the electrolysis product outlet 220. Of course, in other embodiments, multiple leading channels 240 can be provided corresponding to one current collecting channel 700, or one leading channel 240 can be provided corresponding to multiple current collecting channels 700.

[0090] Further, the leading channel 240 has at least one bend. In this way, the flow path length of the leading channel 240 can be increased in a limited space, the bypass circuit is increased, the bypass current is reduced, and the current efficiency is improved.

[0091] Further, the leading channel 240 gradually moves away from the outlet of the corresponding current collecting channel 700 in the first direction. Specifically, the part of the leading channel 240 connected to the current collecting channel 700 can extend at an angle of δ2 or δ4 as shown in Figure 7 , in this way, the leading channel 240 can further guide the electrolysis product in the first direction, and the resistance of the electrolysis product can be reduced, so that the electrolysis product can flow more smoothly into the electrolysis product outlet 220.

[0092] Further, the channel wall of the current collecting channel 700 connecting the leading channel 240 gradually inclines to extend closer to the leading channel 240 in the first direction, specifically, it can extend at an angle of δ1 or δ3 as shown in Figure 7 . In this way, the electrolysis product can be guided to flow in the first direction to the leading channel 240, so that the electrolysis product can flow more smoothly into the leading channel 240.

[0093] In an embodiment, referring to Figure 3 and Figure 10, the second flow guide channels 500 and the first flow guide channels 400 are alternately arranged in the second direction, one second flow guide channel 500 is arranged on each side of the first flow guide channel 400, in the first direction, the number of channels in the first flow guide channels 400 first increases and then decreases, the number of channels in the second flow guide channels 500 first decreases and then increases, and the position of the change in the number of channels of the second flow guide channels 500 is arranged in correspondence with the position of the change in the number of channels of the first flow guide channels 400. That is, the bifurcation of the first flow guide channels 400 corresponds to the confluence of the second flow guide channels 500, and the confluence of the first flow guide channels 400 corresponds to the bifurcation of the second flow guide channels 500. In this way, the flow separation area and the flow convergence area of the first flow guide channels 400 and the second flow guide channels 500 can be staggered to form a more uniform and balanced flow field, so that the electrolyte can be uniformly distributed on the plate surface. Without loss of generality, the convergence order of the second flow guide channels 500 is equal to the flow separation order of the first flow guide channels 400, and the flow separation order of the second flow guide channels 500 is equal to the convergence order of the first flow guide channels 400, to further ensure the uniformity of the flow field. Of course, in other embodiments, as shown in Figures 11 to 13 , the first flow guide channels 400 are arranged at appropriate intervals between the two first flow guide channels 400.

[0094] In an embodiment, please refer to Figure 3 and Figure 10 , the flow guide rib 310 further forms a third flow guide channel 600, the third flow guide channel 600 is located on the side of the plate body 100 in the second direction and is adjacent to the second flow guide channel 500, in the first direction, the number of channels in the third flow guide channel 600 first increases and then decreases, and the position of the change in the number of channels of the third flow guide channel 600 is arranged in correspondence with the position of the change in the number of channels of the second flow guide channel 500, and the flow separation order of the third flow guide channel 600 is less than the convergence order of the second flow guide channel 500, and the convergence order of the third flow guide channel 600 is less than the flow separation order of the second flow guide channel 500. That is, the bifurcation of the third flow guide channel 600 corresponds to the confluence of the second flow guide channel 500, and the confluence of the third flow guide channel 600 corresponds to the bifurcation of the second flow guide channel 500. In this way, the flow separation area and the flow convergence area of the third flow guide channel 600 and the second flow guide channel 500 can be staggered to ensure uniform distribution of the flow field of the plate, and the flow separation order and the convergence order of the third flow guide channel 600 are less, which can reasonably utilize the space on the side of the plate body 100. Of course, in other embodiments, the third flow guide channel 600 located on the side can not be provided with flow separation structure or flow convergence structure, or, as shown in Figures 11 to 13 , only one flow separation structure is provided.

[0095] In one embodiment, please refer to Figure 8 The guide rib 310 extends along the first direction and has a through hole 311 extending along the second direction. Thus, electrolyte or gas in different flow channels distributed in the second direction can communicate with each other through the through hole 311, further ensuring the uniformity of electrolyte distribution and preventing excessive gas accumulation in any area. Specifically, as... Figure 9 As shown, the cross-section of the guide rib 310 can be rectangular, U-shaped, or L-shaped. Of course, in other embodiments, multiple guide ribs 310 are distributed at intervals along the first direction, and adjacent guide ribs 310 are equivalent to forming a break, which can also allow for communication between adjacent channels in the second direction.

[0096] In one embodiment, the diameter of the through-hole 311 is less than or equal to half the height of the guide rib 310. Multiple through-holes 311 are spaced apart in the first direction, and in any two adjacent through-holes 311, one is closer to the top of the guide rib 310, and the other is closer to the bottom. That is, the multiple through-holes 311 are staggered along the height direction of the guide rib 310 in the first direction, thus accommodating both gas and liquid flow while ensuring the structural strength of the guide rib 310. Of course, in other embodiments, the multiple through-holes 311 can also adopt other distribution patterns.

[0097] In one embodiment, please refer to Figure 3 and Figure 10 The adjacent channel walls of the first flow guiding channel 400 and the second flow guiding channel 500 are spaced apart. This spacing acts as a buffer between the adjacent first flow guiding channel 400 and the second flow guiding channel 500, preventing the flow branching area of ​​the first flow guiding channel 400 and the flow confluence area of ​​the second flow guiding channel 500 from clashing, and also preventing the flow confluence area of ​​the first flow guiding channel 400 and the flow branching area of ​​the second flow guiding channel 500 from clashing, thereby ensuring uniform electrolyte distribution.

[0098] In one embodiment, the adjacent channel walls of the third flow channel 600 and the second flow channel 500 are spaced apart. This spacing acts as a buffer between the adjacent third flow channel 600 and the second flow channel 500, preventing the flow branching areas of the third flow channel 600 and the flow confluence areas of the second flow channel 500 from clashing, and also preventing the flow confluence areas of the third flow channel 600 and the flow branching areas of the second flow channel 500 from clashing, thereby ensuring uniform electrolyte distribution.

[0099] In the embodiment, the first flow channel 400 can be connected to the introduction channel 230, and directly receive electrolyte from the electrolyte inlet 210, and then the electrolyte penetrates into the second flow channel 500 and the third flow channel 600 through the through hole 311 on the flow guide rib 310. Of course, the second flow channel 500 and the third flow channel 600 can also be directly connected to the introduction channel 230.

[0100] In an embodiment, referring to Figure 3 , Figure 10 and Figure 11 , at least one of the first flow channel 400, the second flow channel 500 and the third flow channel 600 is symmetrically distributed, and the symmetry axis is the axis of the polar plate extending in the second direction, so as to further improve the uniformity of the distribution of the flow guide rib 310 on the surface of the plate body 100, and thus guarantee the uniformity of the flow field on the surface of the plate body 100.

[0101] In an embodiment, referring to Figure 3 and Figure 10 , the flow guide rib 310 includes a guide rib 312 corresponding to the intersection or bifurcation of the flow channel, and the guide rib 312 has an arc-shaped or inclined guide wall surface. In this way, the electrolyte can be guided at the intersection or bifurcation of the flow channel through the guide wall surface. The arc-shaped or inclined guide wall surface does not bring great resistance to the electrolyte, and can guarantee smooth flow of the electrolyte.

[0102] In an embodiment, referring to Figure 3 and Figure 10 , the flow guide rib 310 further forms a separation channel 800, and each two adjacent separation channels 800 have one separation channel 800. The end of the separation channel 800 close to the introduction section 410 is closed, and the end away from the introduction section 410 has a gap. In this way, the closed end of the separation channel 800 can reliably guide the electrolyte to be distributed to the two adjacent separation channels 421. At the same time, the presence of the separation channel 800 allows the two adjacent separation channels 421 to have a proper spacing, which can guarantee the distribution effect of the electrolyte. When the through hole 311 is provided on the flow guide rib 310, the gas electrolysis product and the electrolyte entering the separation channel 800 can flow out from the gap provided thereon.

[0103] Specifically, the closed end of the separation channel 800 is in the form of a sharp corner or an arc protruding towards the introduction section 410.

[0104] In the embodiment, referring to Figure 3As shown, the closed end of the partition channel 800 is in the shape of a sharp corner, and the channel wall opposite the flow distribution channel 421 is in the shape of an inclined guide rib 312. In this way, the deflection section 4211 is correspondingly in the shape of an inclined section, and the angle of the sharp corner is controlled within a reasonable range (e.g., 0 to 90 degrees), so that the deflection section 4211 can extend a relatively long distance in the first direction, thereby ensuring that the deflection section 4211 reliably guides the electrolyte distribution.

[0105] As shown, the closed end of the partition channel 800 is in the shape of a sharp corner, and the channel wall opposite the flow distribution channel 421 is in the shape of an inclined guide rib 312. In this way, the deflection section 4211 is correspondingly in the shape of an inclined section, and the angle of the sharp corner is controlled within a reasonable range (e.g., 0 to 90 degrees), so that the deflection section 4211 can extend a relatively long distance in the first direction, thereby ensuring that the deflection section 4211 reliably guides the electrolyte distribution. Figure 10

[0106] The present application also proposes an electrolytic cell, which comprises a plate. The specific structure of the plate is described in the above embodiments. Since the electrolytic cell adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described here.

[0107] The above description is only exemplary embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields based on the technical concept of the present application, and the contents of the present application specification and drawings are included in the patent protection scope of the present application.​

Claims

1. A plate, characterized in that The application relates to a plate body (100) and a polar frame (200) surrounding the plate body (100), the polar frame (200) is provided with an electrolyte inlet (210) and an electrolyte product outlet (220), the electrolyte inlet (210) and the electrolyte product outlet (220) are distributed on opposite sides of the plate body (100) along a first direction, the surface of the plate body (100) is provided with a plurality of flow guide ribs (310), and a plurality of the flow guide ribs (310) are configured to form a plurality of flow guide channels; at least one group of first flow guide channels (400) is included in the plurality of flow guide channels, the group of first flow guide channels (400) includes a guide-in section (410) and a plurality of shunt sections (420) arranged in sequence and communicated in the first direction, the electrolyte inlet (210) is communicated with the electrolyte product outlet (220) through the guide-in section (410) and the plurality of shunt sections (420) in sequence, and each shunt section (420) includes a plurality of shunt channels (421) arranged side by side in a second direction, the second direction and the first direction form an angle, and the number of shunt channels (421) of the plurality of shunt sections (420) increases in the first direction in sequence.

2. The pole as claimed in claim 1, wherein The shunt channel (421) includes a side bias section (4211) and a parallel section (4212) which form an angle with the first direction, and the side bias section (4211) and the parallel section (4212) are distributed and connected along the first direction.

3. The pole as claimed in claim 2, wherein The angle between two adjacent side bias sections (4211) arranged side by side is less than or equal to 90 degrees. And / or, in the two shunt sections (420) arranged side by side, the height of the side bias section (4211) located upstream in the first direction is equal to twice the height of the side bias section (4211) located downstream in the first direction. And / or, the parallel section (4212) with the side bias sections (4211) connected at both ends is defined as a first parallel section (4212), and the height of the first parallel section (4212) in the first direction is two to five times the width in the second direction.

4. The pole as claimed in claim 1, wherein The guide-in section (410) includes a first section (411) which is gradually expanded in the first direction and a second section (412) whose channel walls extend in parallel on both sides, and the height of the second section (412) in the first direction is two to five times the width of the second section (412).

5. The pole as claimed in claim 1, wherein The polar frame (200) is formed with an introduction channel (230) communicated with the electrolyte inlet (210), the introduction channel (230) includes a first introduction section (231) and a second introduction section (232), a plurality of groups of the first flow guide channels (400) are distributed in the second direction, the second introduction section (232) extends along the second direction and is formed with a plurality of guide outlets (233), one guide outlet (233) is used for butt joint communication of one guide-in section (410), one end of the first introduction section (231) is communicated with the electrolyte inlet (210), and the other end is communicated between the two ends of the second introduction section (232).

6. The pole as claimed in claim 5, wherein The first introduction section (231) has at least one bend; And / or, the number of the guide outlets (233) is 2 to 8; And / or, the width of the guide outlet (233) is greater than or equal to 2mm.

7. The pole as claimed in claim 5, wherein The first introduction section (231) is connected to the middle of the second introduction section (232), and the same number of groups of the first flow guide channels (400) are distributed between each end of the second introduction section (232) and the connection position of the first introduction section (231).

8. The polar plate of claim 7, wherein The width of the first introduction section (231) is greater than or equal to twice the width of the second introduction section (232); And / or, the ratio of the width of the second introduction section (232) to the width of the guide outlet (233) is greater than or equal to half of the total number of the guide outlets (233); And / or, the opening angle between the two parts of the second introduction section (232) extending away from the connection position of the first introduction section (231) faces away from the first introduction section (231).

9. The pole as claimed in claim 1, wherein The flow guide ribs (310) are also formed with flow collection channels (700), which are located near the edge of the plate body (100) close to the electrolysis product outlet (220) and are communicated with the electrolysis product outlet (220), and one flow collection channel (700) corresponds to multiple groups of the first flow guide channels (400).

10. The pole as claimed in claim 9, wherein The first flow guide channel (400) further includes a flow converging section (430) between the flow dividing section (420) and the flow collection channel (700), and the number of channels distributed in the second direction of the flow converging section (430) is less than the number of flow dividing channels (421) provided at the outlet of the flow dividing section (420).

11. The pole as claimed in claim 10, wherein Multiple levels of flow converging sections (430) are provided between the flow dividing section (420) and the flow collection channel (700), and the number of channels distributed in the second direction of each level of flow converging sections (430) decreases in turn along the first direction.

12. The pole as claimed in claim 9, wherein The channel wall at the outlet of the most downstream flow dividing section (420) extends to the flow collection channel (700).

13. The pole as claimed in claim 12, wherein At the outlet of the most downstream flow dividing section (420), the channel walls on the opposite sides of each flow dividing channel (421) extend to the flow collection channel (700), or one of the channel walls on the same side of each flow dividing channel (421) in the second direction extends to the flow collection channel (700).

14. The pole as claimed in claim 9, wherein The pole frame (200) is formed with an outlet channel (240) communicated with the electrolysis product outlet (220), and one flow collection channel (700) is communicated with the electrolysis product outlet (220) through one outlet channel (240).

15. The pole as claimed in claim 14, wherein The outlet channel (240) has at least one bend; And / or, the outlet channel (240) gradually moves away from the outlet of the corresponding flow collection channel (700) in the first direction; And / or, the channel wall of the flow collection channel (700) connecting the outlet channel (240) is inclined to extend gradually closer to the outlet channel (240) in the first direction.

16. The pole as claimed in claim 1, wherein The guide ribs (310) are also formed with second guide channels (500), the second guide channels (500) and the first guide channels (400) are arranged alternately in the second direction, one second guide channel (500) is arranged on each side of one first guide channel (400), in the first direction, the number of channels in the first guide channels (400) increases first and then decreases, the number of channels in the second guide channels (500) decreases first and then increases, and the position of the change in the number of channels of the second guide channels (500) is arranged correspondingly to the position of the change in the number of channels of the first guide channels (400).

17. The polar plate of claim 16, wherein The guide ribs (310) are also formed with third guide channels (600), the third guide channels (600) are located on the side of the plate body (100) in the second direction and are adjacent to the second guide channels (500), in the first direction, the number of channels in the third guide channels (600) increases first and then decreases, and the position of the change in the number of channels of the third guide channels (600) is arranged correspondingly to the position of the change in the number of channels of the second guide channels (500), and the number of distribution stages of the third guide channels (600) is less than the number of convergence stages of the second guide channels (500), the number of convergence stages of the third guide channels (600) is less than the number of distribution stages of the second guide channels (500); And / or, the number of convergence stages of the second guide channels (500) is equal to the number of distribution stages of the first guide channels (400), and the number of distribution stages of the second guide channels (500) is equal to the number of convergence stages of the first guide channels (400).

18. The pole as claimed in claim 17, wherein The channel walls of the first guide channels (400) and the second guide channels (500) adjacent to each other are arranged at intervals; and / or, the channel walls of the third guide channels (600) and the second guide channels (500) adjacent to each other are arranged at intervals; And / or, at least one of the first guide channels (400), the second guide channels (500) and the third guide channels (600) is symmetrically distributed, and the symmetry axis is the axis along which the polar plate extends in the second direction.

19. The pole as claimed in claim 1, wherein The guide ribs (310) include guide ribs (312) corresponding to the intersections or bifurcations of the guide channels, the guide ribs (312) have guide wall surfaces in the shape of an arc surface or an inclined surface.

20. The pole as claimed in claim 1, wherein The guide ribs (310) are also formed with separation channels (800), each two adjacent distribution channels (421) of the same stage have one separation channel (800) therebetween, one end of the separation channel (800) close to the guide-in section (410) is closed, and the other end away from the guide-in section (410) has a notch.

21. The polar plate of claim 20, wherein, The closed end of the separation channel (800) is in the shape of a sharp corner or an arc facing away from the guide-in section (410).

22. The plate of any one of claims 1 to 21, wherein The guide ribs (310) extend in the first direction and are provided with through holes (311) penetrating in the second direction.

23. The polar plate of claim 22, wherein The diameter of the via hole (311) is less than or equal to half of the height of the flow guide fin (310), a plurality of the via holes (311) are distributed at intervals in the first direction, and in any two adjacent via holes (311), one via hole (311) is close to the top of the flow guide fin (310), and the other via hole (311) is close to the bottom of the flow guide fin (310).

24. An electrolytic cell characterized by, The polar plate of any one of claims 1 to 23.

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